Coronary Crossing System in Patients With Coronary Chronic Total Occlusions

Inclusion criteria

• . Aged 18 years and older.
• . Subjects with coronary artery disease who have symptoms of angina pectoris and evidence of ischemia or myocardial viability in the area innervated by the coronary arteries where the CTO is located.
• . Subjects who are able to understand the purpose of the trial, participate voluntarily or by proxy and indicate by signing the informed consent form that they recognize the risks and benefits described in the informed consent document and are willing to undergo clinical follow-up.
• . There is only one target CTO that needs to be treated with percutaneous coronary intervention (PCI).
• . Target CTO is located in a native coronary artery with a reference vessel diameter of ≥ 2.5 mm.
• . Angiography showed complete occlusion of the target CTO (visual inspection), antegrade flow of the occluded vessel segment TIMI grade 0 and inferred occlusion time ≥ 3 months; or previous angiographic records confirmed occluded time of the target CTO ≥ 3 months.
• . The target CTO occluded segment length ≥ 5 mm (visual inspection).
• . Angiography of the target CTO showed high density along the vessel, which is considered calcified lesion.

Exclusion criteria